Three Mile Island: the worse nuclear accident in US history. The government and industry position hasn't changed in 30 years. Officials say the amount of radiation released from the plant during the 1979 disaster was small -- the maximum anyone could have received was equivalent to a chest X-Ray. But there is medical evidence to prove otherwise. According to Dr. Steven Wing of the University of North Carolina Chapel Hill, cancers in local residents were elevated under the path of the radioactive plume that escaped from the plant. Symptoms of radiation exposure were severe and there were chromosomal abnormalities reported in people even 15 years after the event.